/*
 * Sound/Music functions
 * 
 * Components:
 *   Arduino board
 *   8-Ohm Speaker
 * 
 * Wiring:
 *   Pin 10 goes to speaker's "+" pole
 *   Speaker's "-" pole goes to GND (ground) via 100 Ohm resistor
 *
 * Based on:
 *   http://itp.nyu.edu/physcomp/labs/labs-arduino-digital-and-analog/tone-output-using-an-arduino/
 */

#define pin_audio 10 

/*
 * Note frequencies
 */
#define PAUSE 0
#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978

/*
 * Some tunes
 */

int melody0[] = {
  NOTE_G3, 4,
  NOTE_B3, 4,
  NOTE_C4, 4,
  NOTE_G3, 4
};

int melody1[] = {
  NOTE_C4, 4,
  NOTE_G3, 8,
  NOTE_G3, 8,
  NOTE_A3, 4
};

int melody2[] = {
  NOTE_G4, 4,
  NOTE_F3, 4,
  NOTE_E3, 4,
  NOTE_D3, 4
};

int melody3[] = {
  NOTE_A4, 4,
  NOTE_B3, 4,
  NOTE_C4, 4,
  NOTE_D3, 4
};

#define melody0_length ((sizeof melody0) / (sizeof (int)) / 2)
#define melody1_length ((sizeof melody1) / (sizeof (int)) / 2)
#define melody2_length ((sizeof melody2) / (sizeof (int)) / 2)
#define melody3_length ((sizeof melody3) / (sizeof (int)) / 2)

/*
 * Initialiation
 */
void  init_speaker() {
}

/*
 * Plays given melody, where melody is an array of NOTE, DURACTION pairs
 */
void play(int* melody, int count) {
  // iterate over the notes of the melody:
  for (int i = 0; i < count; i++) {
    int pos = i*2;

    // to calculate the note duration, take one second
    // divided by the note type.
    //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
    int noteDuration = 1000 / melody[pos + 1];
    tone(pin_audio, melody[pos], noteDuration);

    // to distinguish the notes, set a minimum time between them.
    // the note's duration + 30% seems to work well:
    delay(noteDuration * 1.30);

    // stop the tone playing:
    noTone(pin_audio);
  }
}

/*
 * Plays a different tune for R, G, B color elements
 */
void show_color_name_speaker(bool isRed, bool isGreen, bool isBlue) {
  if (isRed)
    play(melody1, melody1_length);      
  
  if (isGreen)
    play(melody2, melody2_length);      

  if (isBlue)
    play(melody3, melody3_length);      
}

